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Note 11 - Earnings Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Net income attributable to SPAR Group, Inc. $ 866 $ 674
Weighted-average common shares outstanding – basic (in shares) 23,114 21,583
Stock options and unvested restricted shares (in shares) 165 146
Weighted-average common shares outstanding – diluted (in shares) 23,279 21,729
Basic income per common share attributable to SPAR Group, Inc. (in dollars per share) $ 0.04 $ 0.03
Diluted income per common share attributable to SPAR Group, Inc. (in dollars per share) $ 0.04 $ 0.03